import sys
input = sys.stdin.readline
mod = 998244353

N = int(input())
S = input().rstrip('\n')

S = list(S)
for i in range(N):
    if S[i] == "?":
        if i > 0:
            if S[i - 1] == "w":
                S[i] = "a"
        if i != N - 1:
            if S[i + 1] == "a" or S[i + 1] == "o":
                S[i] = "w"

while S:
    if len(S) == 1:
        if S[0] == "?" or S[0] == "n":
            S.pop()
        else:
            print("No")
            exit()
    else:
        if S[-2:] == ["w", "a"] or S[-2:] == ["w", "o"]:
            S.pop()
            S.pop()
        elif S[-1] == "n" or S[-1] == "?":
            S.pop()
        else:
            print("No")
            exit()
print("Yes")